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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32ee55b3a7d2676bb7f8dcbd860d8a6baa273a8f72630a20293c7e1787a6a96' 
  AND token = 'pCjjNuk4bwcEzzZlCaBUunWh+HM6opGREj3c9pnydws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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