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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7105c3112a289c81693a0ef838122084631282ed9dff6e0e6d71b61fe6069d8d' 
  AND token = 'WJ5PDU5yTk9rZfgNKpVtkF8ZSKqet2TTn+3wzxyYZKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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