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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69174d3d1c6941961d5bdeef7f9d19f2173bf520d15618140389763e249b182c' 
  AND token = 'c6vh9h7/ma3QsnDJJUL8jf4aTMQroBpD8I835twM124=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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