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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef0e6b25257f849191ec0354033095aa40d50cf636d8a64031871277ef3606d' 
  AND token = 'Vn1032RHoPycPGbpzT1xbEissZZBjY0IWZB2ttg76Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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