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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a2188dbe4c7416270d86fec09a4b76e1dc7a612cb82db738905f4a52d492e6' 
  AND token = 'FZaiQeKYjCACZQIQ6o8Ffd1TLAbhtW1j1MSvTUCzr7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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