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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102889d4da724fa25156adcca82b89419fa588242c4b7ce9d47cd6bf81db8213' 
  AND token = '7mq9WqFTu6nMXVLwD4rHU8U+vppmn8+jQs4brpd9J5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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