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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec94ba13cf3c59573e23e9b90406537580078bfa07d7e35a2e2381733a9fce2' 
  AND token = 'yhNV9/GBXeoe3Ccz6orXjLNRbmq/UzLPpmus7Ij+Cns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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