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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b290dd91de06e838baf68b599eb025e6d3a5c178cc501014a6308ab4d43ca1f6' 
  AND token = 'dAR2LMVILXfMW4ReZE9tYW7G2Y3ydJYw2rDGxV87Esk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}