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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042dd6867e6fdb1524eabfd72443e69f09b4d20d92d23e3c4af298de48a736a8' 
  AND token = '58Cxf7rFEPgDbC2pMPwoZER45ndGYGW3SfHfdMRVVP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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