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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb084babc10a9d3fd7adff3c2e8d4d9d24feeedf1a15ed85706a87afa76ac2e' 
  AND token = 'TcgMCSPpOLjriv6I5M94OBLsWBu3IL+BgtZBB67OcpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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