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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3802968baaab08b9eec479254229c3b3220ac7ea6d167aa607e9873b9a19c1f' 
  AND token = 'a+5/utdFJu4o76UmrDODmX/Nzp/PIQUaPuxINS6vNL8=' 
  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"
    }
  }
}