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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba348feb19d58c1d0fe822158d47aa6ed94c5a1ba55679d6c08818519dc7843' 
  AND token = '4Ss5EshXvJq7o40zXNEeFOG33nVN+J/xPycVpA0UUMQ=' 
  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"
    }
  }
}