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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab867c98f7d0d2db315d9b78f849d4eec7d1373e335ecc6a3c8fe10ec2bd72ea' 
  AND token = 'uIZBdwQvTNnuvoQ6PTaSsVR9i9+vvq6cNA7hwMfNH64=' 
  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"
    }
  }
}