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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b34132c91fdf86bc60e7d404fe9f018609fff105ad77ab29ed2c462be464638' 
  AND token = '6GkafyoLRJ5poT+vknijG8rPc2OFi4bSrj9Y7AeJ7kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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