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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ddfcb70af9afaa502f6317abd1dd195558ffa82954ad811fb1ce7455ac172e' 
  AND token = 'wcqXL5SJud7nRExoD+iB0Kr3SA23lz8Fsk9PIoaNGyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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