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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d6cc6aa60eb5803b5623cf2076dd08f69079dd1852720951de2b9990e71a1d' 
  AND token = 'Y1pZ5v5slM2COQfDorT9ubHPUErm6V6jKuTP3DO0X9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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