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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed94ef4247fd508279f5a1d67f0e114ac76fdb75b8f78ad4397bd710db616841' 
  AND token = 'S3scLT/6moUDkTTyTh8Sbd037fZCFtNkUBW0GO/aXy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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