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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23e7bd20ba37aee5f954d4e9db46d6a5be3f57e6c39c5771112796ef348fec4' 
  AND token = 'ijLQfPlzz8eUa9AXlqvFqsJ29A2sD4AJx/vkgu4GTMQ=' 
  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"
    }
  }
}