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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5d7be65a6272230336115d7e09ab8daf639bba7d41b6696e2c4d807266c685' 
  AND token = 'PI8KN4qt7dljAYJADOMaaY/Gk6NmKBMU3Za6KfL1Zo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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