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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4733c6a5c8d898d816547ed5e7394a40fe1f1b7692d96957ef066ed427d894' 
  AND token = 'T/Ahwkq4FN2iprKV6a9fq3B3UH16pRBQA29ZV3J2C2g=' 
  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"
    }
  }
}