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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46acb4ace3768214891fc93fc6a1d03ea781613e98da45c05c86dd2bed4986c2' 
  AND token = 'Fgxb/cCkZrUhMD58ys5GXGNnW2o42gHTaY5MhNDJvAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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