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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a48f4c2d33c7da5677c2fa9fd7e5166b74d98d3824111ec27ba8e95c15a159' 
  AND token = 'fE3n+OmlSxs2MOEhwAK9GOoPzeLcoCAph5HjUQxMoEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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