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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efed16f040b0f02315550d45668a28406b8df7101b64607d9dba2de9a60c0b17' 
  AND token = '8o9byzyyfmL8vwqm7pyupe3NTeqdNtmzDTQn56LTync=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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