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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dbcd7de6ac9a9638ecb7f9903d5544009bbb7c983c3352a076efeccaf3f1c0' 
  AND token = '79/HXl10knR/d/9vy+b4/AcmOBw9KDUHRfG/41pqh2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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