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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc330d39aab9dc55e3573ccd1f48bde67ce7eca0e32de7ce7f5baecb88e2a88' 
  AND token = 'cP1ArdQvcV52PF0l1DpTC2dj2sr0Lnx7VV5LOMf2+m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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