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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7851e773a2d9e06ddde393c17a2411d5749a56912c1abf352b71a6e30fae6d' 
  AND token = 'VxVSibDkBB/d9RAJ9B2TiGOZ1EoXcf3z/2hZK43bPmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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