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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6dd11448d69877c727b3d80748c419b1e8990f2e3954939b93cde32c683e25' 
  AND token = 'REp6+3Pw6AG6jdWNaWU38dEbbTmMKbbz7MPl3a0KoUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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