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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bbf17464cc4c58386e54e014d2d0e678e54c9ce1e4c9dbe33d0bcf5893bac4' 
  AND token = 'ThdFeT2ehlng6HQBsVAQOlRrO8GLqSqX4ySon8YKTi0=' 
  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"
    }
  }
}