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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c416d8e6dd0af577124b812317429e85aeb5a1d0bba3cb839b0d2910050d7894' 
  AND token = 'uEeuCrAcE5ZXkMHYA/LIJVGDc3+cBg5UWEw5ZjPZpMc=' 
  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"
    }
  }
}