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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452697cad9e00b3ca948b026f6db5b2136f8c76fa8fdb282b559abe6c7c7786c' 
  AND token = 'lONo8yf8AYOt9v4eiKI+PIDj07MboobWpd1VJeDV6Sw=' 
  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"
    }
  }
}