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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332f78190d87a1f7a81e4bed959a9054059c86c89b41d9c40cc08079ce300f64' 
  AND token = 'Qgo1MOkOoVSN6e+iix7WoiwqLMhv2P5SCob1U04E30w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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