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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fa45ffaf90fc08670c212edbfa1e276f07881c5cc2bb71d6b13c76c0fe5125' 
  AND token = 'G6shq/T3wj/G3zP0FiYAQZa8TD+MAD3ABdDp/kwu2T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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