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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3cf682035dcd8329555795b5c3190bc704d30ea4afd44bf9715a06547c85d3' 
  AND token = '8llayuVjFQeFM8Qvmc7UyaSneUpZwh//2doFUvI/P6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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