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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80776a9a81cd24a48fbec7e8c698c71bb975ad8bc757c1f982628c9f99a37d2f' 
  AND token = 'S359V7K0/JQ7cbarMwk9UGgXHPJbrD4XqZbMv1tiPNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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