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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87f63506391a9d968b6eb52cee5f8fd0a89944f49cc8d1cd78747ad2d9fd4c2' 
  AND token = 'IK1z7qr9seqdLlTOdZeFVUpwTHM+IoDMPSgChti7Oq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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