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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc15a684633169d1a388d8987ebafe84cb92fa9d30cddc93aae17836d3a3193d' 
  AND token = 'bDS67VvXeak2ul6dSrQVbLEFZaA1aix+8DtfKDdD8cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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