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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ba9ae6510869ef85180384a96f414d6aa92f62af9a3a08dcce2dc5af12f6ee' 
  AND token = 'x1K+cRFHNOdzU6GCBF54LfkX0dZXT5ZkI0OpAyBsX4U=' 
  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"
    }
  }
}