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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778dd33539504e1b0c1c4868d5580896f84a9d4b73e4c54ed3a3f4285f070d09' 
  AND token = 'xG09Nd6Z5bgaQms0MqkmVolnXbwGh54Dl5KqaYiY9yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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