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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efc9cfe706b27e460ffe6490a26a74da92ce82bf4274097fd9260170ca9fc4e' 
  AND token = 'PN3ykp5wsRiVMCc2jJJ9Le3vVEV6DEMU4PjcXaqvLk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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