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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae27383a9a61df55afaa88d8081f2937ef1c3330ff31b94ec6f99339f291b746' 
  AND token = 'wX6n3B77qMbaM3DZ1gWQSTeeCY1BLoMYlM8rPSaJkhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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