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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c76f67d866ed100d7cadd1fa90bcb6edbc545b05acb51a23e370befc715a8b' 
  AND token = 'e3ecvWQcwW72UMsGGDyL0BdbUXCJ5IMM24Pcl9S3NU0=' 
  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"
    }
  }
}