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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd0ee3892ad6c18ea0019610db1a19af0d9ff40e7a9ca992bb3dfc254b0f6b2' 
  AND token = 'R9qFRw+advfDRVK6Kfuye4BALk5MfbY+bfCq+fTH/lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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