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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac8f634a36df5947f01a74c5390118a959bee9f0c087d42d35487acfc8ad822' 
  AND token = '2Sjrt8rh/5celUZfuiMWGAwbv0Y7hpvom2+gkEYSpNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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